[OpenWrt-Devel] kernel.mk: add KCFLAGS to make kmods reproducible
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Message ID 20191008231127.23755-1-mail@aparcar.org
State Accepted
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Series
  • [OpenWrt-Devel] kernel.mk: add KCFLAGS to make kmods reproducible
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Commit Message

Paul Spooren Oct. 8, 2019, 11:11 p.m. UTC
Some kmods (gpio-hotplug, wireguard) store the build path in the
compiled files and therefore make it harder to rebuild the official
binaries. As the same "iremap" function is used as for other binaries,
the change is compatible with gcc7 and 8.

Tested with both gcc7 and gcc8 resulting in build path independent
reproducible builds.

Signed-off-by: Paul Spooren <mail@aparcar.org>
---
 include/kernel.mk | 1 +
 1 file changed, 1 insertion(+)

Patch
diff mbox series

diff --git a/include/kernel.mk b/include/kernel.mk
index 73645330fe..439e910ebf 100644
--- a/include/kernel.mk
+++ b/include/kernel.mk
@@ -104,6 +104,7 @@  endif
 KERNEL_MAKE = $(MAKE) $(KERNEL_MAKEOPTS)
 
 KERNEL_MAKE_FLAGS = \
+	KCFLAGS="$(call iremap,$(BUILD_DIR),$(notdir $(BUILD_DIR)))" \
 	HOSTCFLAGS="$(HOST_CFLAGS) -Wall -Wmissing-prototypes -Wstrict-prototypes" \
 	CROSS_COMPILE="$(KERNEL_CROSS)" \
 	ARCH="$(LINUX_KARCH)" \